This preview shows page 1. Sign up to view the full content.
2.66. Set Up:
At this point Voyager 1 is
from the sun and the earth is
from the sun, on
the same side as Voyager 1. Thus, Voyager 1 is
from the earth. The speed of the radio waves is
Solve:
2.67. Set Up:
Solve:
2.68. Set Up:
At
the auto and truck are at the same position. The auto overtakes the truck when after time
T
they have both traveled a distance
d
.
Solve: (a)
Apply
to the motion of each vehicle. The auto has
and
so
The truck has
and
so
Combining these two equa
tions gives
and
Then
(b)
2.69. Set Up:
Let
d
be the distance from home to work.
Solve: (a)
The time to get to work is
The time to return home is
The average speed for
the round trip is the total distance 2
d
divided by the total time
(b)
The travel times at each speed are not the same. More time is spent traveling at 40 mph so the average speed is
less than
Reflect:
If the two average speeds for each oneway trip are
and
then the average speed for the roundtrip is
If
then the average speed is this speed
If the speeds differ a lot, then the average
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg

Click to edit the document details